WARNING TO ALL LEET LOUNGERS!
You will not be able to use any CSS prop (Including DarkRP guns!!!) unless if you use the following fix! (Or it magically fixed on its own for you, or if you never even downloaded the update.)
Basically, CSS updated all models and textures, however hardly noticable. You still have to refresh your content from 2008's version to 2010's version.
To do so, start up CSS to the main menu. Then, exit CSS.
Afterwards, download GCFScape and install it.
Goto Steam/Steamapps and look for Counter Strike Source Shared (The larger of the two css gcf's)
Exact all the models/materials/textures/sounds to your desktop.
Once that finishes, goto Steam/Steamapps/ACCOUNTHERE/Counter STrike Source/cstrike.
Put all those folders inside the cstrike folder. If it asks to overrite, click YES!
Note: If you don't have a CSS folder at all, extact all of the counter strike source GCF's and place them in your account folder.